➀ This article discusses a cost-effective solution for tracking intrusions in a monitored space using a laser sensor and Google Sheets. The setup involves a WeMos D1 Mini, a laser transmitter, and an optical receiver, with updates recorded on a Google Sheet. ➁ The system is designed to track the exact date and time of intrusions and can be used in areas requiring movement logging. ➂ The article provides details on the features and technical specifications of the laser module and receiver module used in the device, as well as the circuit and working principles.